Version v0.2.37 - implemented files directory support with smart default paths for all file operations

files/test_decrypt.txt

@@ -0,0 +1 @@
+Test file content for decryption

files/test_file.txt

@@ -0,0 +1 @@
+Hello, this is a test file for encryption!

files/test_file.txt.otp.asc

@@ -0,0 +1,7 @@
+-----BEGIN OTP MESSAGE-----
+Version: v0.2.29
+Pad-ChkSum: d0d4a489354348b08d8c7b324814d8c50010042e9da47f2c973f32a16a09101b
+Pad-Offset: 57
+
+05S8GfS0tFfczNMUz0xrieFGoPSREM4uo5QhFGoBCcOzjfTXTDMt3hRtAQ==
+-----END OTP MESSAGE-----

files/test_input.txt

@@ -0,0 +1 @@
+This is a test file for encryption.

otp.c

@@ -40,6 +40,7 @@ static const int base64_decode_table[256] = {
 #define MAX_HASH_LENGTH 65
 #define PROGRESS_UPDATE_INTERVAL (64 * 1024 * 1024)  // 64MB intervals
 #define PADS_DIR "pads"
+#define FILES_DIR "files"
 #define MAX_ENTROPY_BUFFER 32768  // 32KB entropy buffer
 
 // Function prototypes
@@ -72,7 +73,10 @@ void simple_entropy_mix(unsigned char* urandom_buffer, size_t buffer_size,
 
 // Directory management
 int ensure_pads_directory(void);
+int ensure_files_directory(void);
 void get_pad_path(const char* chksum, char* pad_path, char* state_path);
+const char* get_files_directory(void);
+void get_default_file_path(const char* filename, char* result_path, size_t result_size);
 
 // Utility functions
 uint64_t parse_size_string(const char* size_str);
@@ -271,7 +275,7 @@ int command_line_mode(int argc, char* argv[]) {
 }
 
 void show_main_menu(void) {
-    printf("=== Main Menu ===\n\n");
+    printf("======================== Main Menu ========================\n");
     printf("\033[4mT\033[0mext encrypt\n");
     printf("\033[4mF\033[0mile encrypt\n");
     printf("\033[4mD\033[0mecrypt\n");
@@ -461,16 +465,27 @@ int handle_encrypt_menu(void) {
         
         int ascii_armor = (atoi(format_input) == 2) ? 1 : 0;
         
-        // Ask for custom output filename (optional)
+        // Generate default output filename with files directory and use enhanced input function
-        printf("\nEnter output filename (or press Enter for default): ");
+        char default_output[1024]; // Increased size to prevent truncation warnings
+        char temp_default[1024];
+        
+        // Generate base filename with appropriate extension
+        if (ascii_armor) {
+            snprintf(temp_default, sizeof(temp_default), "%s.otp.asc", input_file);
+        } else {
+            snprintf(temp_default, sizeof(temp_default), "%s.otp", input_file);
+        }
+        
+        // Apply files directory default path
+        get_default_file_path(temp_default, default_output, sizeof(default_output));
+        
         char output_file[512];
-        if (!fgets(output_file, sizeof(output_file), stdin)) {
+        if (get_filename_with_default("Output filename:", default_output, output_file, sizeof(output_file)) != 0) {
             printf("Error: Failed to read input\n");
             return 1;
         }
-        output_file[strcspn(output_file, "\n")] = 0;
         
-        const char* output_filename = (strlen(output_file) > 0) ? output_file : NULL;
+        const char* output_filename = output_file;
         
         return encrypt_file(pad_input, input_file, output_filename, ascii_armor);
     }
@@ -517,16 +532,36 @@ int handle_decrypt_menu(void) {
             return 1;
         }
         
-        // Ask for custom output filename (optional)
+        // Generate smart default output filename with files directory and use enhanced input function
-        printf("\nEnter output filename (or press Enter for default): ");
+        char temp_default[512];
+        char default_output[512];
+        strncpy(temp_default, input_file, sizeof(temp_default) - 1);
+        temp_default[sizeof(temp_default) - 1] = '\0';
+        
+        // Remove common encrypted extensions to get a better default
+        if (strstr(temp_default, ".otp.asc")) {
+            // Replace .otp.asc with original extension or no extension
+            char* ext_pos = strstr(temp_default, ".otp.asc");
+            *ext_pos = '\0';
+        } else if (strstr(temp_default, ".otp")) {
+            // Replace .otp with original extension or no extension  
+            char* ext_pos = strstr(temp_default, ".otp");
+            *ext_pos = '\0';
+        } else {
+            // No recognized encrypted extension, add .decrypted suffix
+            strncat(temp_default, ".decrypted", sizeof(temp_default) - strlen(temp_default) - 1);
+        }
+        
+        // Apply files directory default path
+        get_default_file_path(temp_default, default_output, sizeof(default_output));
+        
         char output_file[512];
-        if (!fgets(output_file, sizeof(output_file), stdin)) {
+        if (get_filename_with_default("Output filename:", default_output, output_file, sizeof(output_file)) != 0) {
             printf("Error: Failed to read input\n");
             return 1;
         }
-        output_file[strcspn(output_file, "\n")] = 0;
         
-        const char* output_filename = (strlen(output_file) > 0) ? output_file : NULL;
+        const char* output_filename = output_file;
         
         return decrypt_file(input_file, output_filename);
     }
@@ -2208,6 +2243,38 @@ int ensure_pads_directory(void) {
     return 0;
 }
 
+int ensure_files_directory(void) {
+    struct stat st = {0};
+    if (stat(FILES_DIR, &st) == -1) {
+        if (mkdir(FILES_DIR, 0755) != 0) {
+            return 1;
+        }
+    }
+    return 0;
+}
+
+const char* get_files_directory(void) {
+    struct stat st = {0};
+    if (stat(FILES_DIR, &st) == 0 && S_ISDIR(st.st_mode)) {
+        return FILES_DIR;
+    }
+    return "."; // Fall back to current directory
+}
+
+void get_default_file_path(const char* filename, char* result_path, size_t result_size) {
+    const char* files_dir = get_files_directory();
+    
+    // If filename already has a path (contains '/'), use it as-is
+    if (strchr(filename, '/') != NULL) {
+        strncpy(result_path, filename, result_size - 1);
+        result_path[result_size - 1] = '\0';
+        return;
+    }
+    
+    // Otherwise, prepend the files directory
+    snprintf(result_path, result_size, "%s/%s", files_dir, filename);
+}
+
 void get_pad_path(const char* chksum, char* pad_path, char* state_path) {
     snprintf(pad_path, MAX_HASH_LENGTH + 20, "%s/%s.pad", PADS_DIR, chksum);
     snprintf(state_path, MAX_HASH_LENGTH + 20, "%s/%s.state", PADS_DIR, chksum);
@@ -2447,7 +2514,7 @@ int get_filename_with_default(const char* prompt, const char* default_path, char
             }
         } else if (c >= 32 && c <= 126) {
             // Printable character
-            if (buffer_len < sizeof(edit_buffer) - 1) {
+            if (buffer_len < (int)sizeof(edit_buffer) - 1) {
                 // Move everything after cursor one position right
                 memmove(&edit_buffer[cursor_pos + 1], &edit_buffer[cursor_pos], buffer_len - cursor_pos + 1);
                 edit_buffer[cursor_pos] = c;